“The pain, the panic, the uncertainty of not knowing what was happening, or how long it would last... they were the longest and hardest 15 minutes of my life,” the Spanish defender wrote in a message posted on Instagram.

The 26-year-old said “the shock of the past few days is diminishing all the time” and that when he looks at his swollen wrist, what he feels is “pride”.

“I look at it proud thinking of all the damage they wanted to do to us on Tuesday and it resulted in just that,” he said, thanking those who are treating him as well as fans, his team-mates and others who have showered him with support.

“I needed to write and get this off my chest and settle it so I can just think about getting back to 100 percent as soon as possible,” he added.

Germany has been on high alert since a series of jihadist attacks last year, including a deadly Christmas market truck rampage in Berlin.

Dortmund, which eventually played the delayed match against Monaco a day after the attack, is preparing to host Eintracht Frankfurt in a Bundesliga tie on Saturday.

The club’s manager Thomas Tuchel had hit out at the decision to play the Monaco Champions League game so soon after the assault, saying they were treated as if only a “beer can” had been thrown at their bus.